<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<div id="app">
    <span v-bind:title="message">
        鼠标悬停几秒即可查看此处动态绑定的提示信息
    </span>
</div>

<div id="app2">
    <span v-text="message">

    </span>
</div>

<script src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></script>
<script>
    var vm = new Vue({
        el: '#app',
        data: {
            message: "hello vue!"
        }
    });

    var vm2 = new Vue({
        el: '#app2',
        data: {
            message: "我是 app2"
        }
    });
</script>
</body>
</html>